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 == References ==
 
-* [https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2016-February/012470.html Bitcoin Vaults (2016)]
-* [https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2020-April/017755.html On-chain vaults prototype (2020)]
+* [https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2016-February/012470.html [bitcoin-dev] Bitcoin Vaults (2016)]
+* [https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2018-February/015793.html [bitcoin-dev] Simple lock/unlock mechanism (2018)]
+* [https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2020-April/017755.html [bitcoin-dev] On-chain vaults prototype (2020)]
 * [https://arxiv.org/abs/2005.11776 Custody Protocols Using Bitcoin Vaults (2020)]
 * [https://jameso.be/vaults.pdf Vaults and Covenants (2023)]